text: /**
  * @license Apache-2.0
  *
  * Copyright (c) 2018 The Stdlib Authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *    http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
  
  'use strict';
  
  // MODULES //
  
  var constantFunction = require( '@stdlib/utils/constant-function' );
  var isInteger = require( '@stdlib/math/base/assert/is-integer' );
  var isnan = require( '@stdlib/math/base/assert/is-nan' );
  var floor = require( '@stdlib/math/base/special/floor' );
  var ln = require( '@stdlib/math/base/special/ln' );
  var NINF = require( '@stdlib/constants/float64/ninf' );
  
  
  // MAIN //
  
  /**
  * Returns a function for evaluating the natural logarithm of the cumulative distribution function (CDF) for a discrete uniform distribution with minimum support `a` and maximum support `b`.
  *
  * @param {integer} a - minimum support
  * @param {integer} b - maximum support
  * @returns {Function} logCDF
  *
  * @example
  * var logcdf = factory( 0, 10 );
  * var y = logcdf( 0.5 );
  * // returns ~-2.398
  *
  * y = logcdf( 8.0 );
  * // returns ~-0.201
  */
  function factory( a, b ) {
  	var logn;
  	var am1;
  	if (
  		isnan( a ) ||
  		isnan( b ) ||
  		!isInteger( a ) ||
  		!isInteger( b ) ||
  		a > b
  	) {
  		return constantFunction( NaN );
  	}
  	am1 = a - 1.0;
  	logn = ln( b - a + 1.0 );
  	return logcdf;
  
  	/**
  	* Evaluates the natural logarithm of the cumulative distribution function (CDF) for a discrete uniform distribution.
  	*
  	* @private
  	* @param {number} x - input value
  	* @returns {number} evaluated logCDF
  	*
  	* @example
  	* var y = logcdf( 2.0 );
  	* // returns <number>
  	*/
  	function logcdf( x ) {
  		if ( isnan( x ) ) {
  			return NaN;
  		}
  		if ( x < a ) {
  			return NINF;
  		}
  		if ( x >= b ) {
  			return 0.0;
  		}
  		return ln( floor( x ) - am1 ) - logn;
  	}
  }
  
  
  // EXPORTS //
  
  module.exports = factory;
  